Question

Hello! I _________ you _________ in Beijing．How long have you been here?

[　　]

A．

don’t know; were

B．

haven’t known; are

C．

hadn’t known; are

D．

didn’t know; were

Answer 1

答案：D
解析：

根据语境知道“我原来不知道你在北京”(当然说话时已经知道了)，所以用一般过去时。